Nissan Qashqai J11. Manual - part 97

CYLINDER HEAD

EM-327

< UNIT DISASSEMBLY AND ASSEMBLY >

[K9K]

Push the valve stem seal past the tool barrel, then withdraw the
barrel.

Place the guide tube plus push rod assembly on the valve stem
seal.

Push the valve stem seal down by tapping the top of the sleeve
with the palm of your hand until the guide tube touches the cylin-
der head.

Repeat these operations for all the valves.

10. Install the valve springs and valve spring retainers using valve

spring compressor.

11. Install the valve collets using tweezers.

12. Install in the reverse order of removal after this step.

Cleaning

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• It is very important not to scratch the gasket faces of any aluminum components.
• Use suitable tool to dissolve any part of the seal which remains stuck to the metal surface.
• Apply the dissolving product to the part to be cleaned, wait approximately 10 minutes, then remove it using a

wooden spatula.

• Wear gloves while carrying out this operation.
• Do not allow this dissolving product to drip on to the paintwork.
• Great care should be taken when performing this operation, to prevent foreign objects from entering

the pipes taking oil under pressure to the camshafts (pipes in both the cylinder head and its cover)
and the oil return pipes.

MBIB0424E

MBIB0425E

MBIB0416E

EM-328

< UNIT DISASSEMBLY AND ASSEMBLY >

[K9K]

CYLINDER HEAD

• Failure to follow these instructions could lead to the blocking of the oilways, resulting in rapid and

serious damage to the engine.

Inspection

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INSPECTION AFTER REMOVAL

Cylinder Head Distortion

NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer to

EM-356,

"Cylinder Block"

Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.

CAUTION:

Use utmost care not to allow gasket debris to enter passages for engine oil or water.

At each of several locations on bottom surface of cylinder head, measure the distortion in six directions
using straightedge and feeler gauge.

• If it exceeds the limit, replace cylinder head.

Cylinder Head Height

Measure the height of cylinder head (H).

Valve protrusion

Check the valve protrusion using dial gauge stand set [KV113B0040
(Mot.251-01) (commercial service tool) or equivalent tool] and dial
gauge stand set [KV113B0050 (Mot.252-01) (commercial service
tool) or equivalent tool] as shown.

INSPECTION AFTER DISASSEMBLY

Valve

Measure the valves as follows.
• Stem diameter (d)

• Face angle (

)

Limit

: Refer to